Executing a query on a table in Editor, Data Grid does not show table data of certain columns, such as NVARCHAR2 data types.
Oracle client installed on machine is an older version than the Oracle server. For example, client version is 8.0.6 and server is 10g. This combination of versions is not supported by Oracle.
Upgrade Oracle client installed on machine to a higher version or the same version as the Oracle server.
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